<template>
  <el-breadcrumb class="app-breadcrumb" separator="/">
    <transition-group name="breadcrumb" mode="out-in">
      <el-breadcrumb-item v-for="(item,index)  in levelList" :key="item.path" v-if='item.meta.title'>
        <span v-if='item.redirect==="index"||index==levelList.length-1' class="no-redirect">{{ item.meta.title }}</span>
        <router-link v-else :to="item.redirect||item.path">{{ item.meta.title }}</router-link>
      </el-breadcrumb-item>
    </transition-group>
  </el-breadcrumb>
</template>

<script>
export default {
  created() {
    this.getBreadcrumb()
  },
  data() {
    return {
      levelList: null
    }
  },
  watch: {
    $route() {

      this.getBreadcrumb()
    }
  },
  methods: {
    getBreadcrumb() {
      let matched = this.$route.matched.filter(
          item => item.meta && item.meta.title && item.meta.breadcrumb !== false
      )

      const first = matched[0]
      if (first && first.name !== 'index') {
        matched = [{path: '/index', meta: {title: '首页'}}].concat(matched)
      }
      this.levelList = matched
    }
  }
}
</script>

<style scoped>
.breadcrumb-enter-active,
.breadcrumb-leave-active {
  transition: all 0.5s;
}
.breadcrumb-enter,
.breadcrumb-leave-active {
  opacity: 0;
  transform: translateX(20px);
}

.breadcrumb-move {
  transition: all 0.5s;
}

.breadcrumb-leave-active {
  position: absolute;;
}
</style>
